JPH06333000A - Color conversion processing device - Google Patents

Color conversion processing device

Info

Publication number
JPH06333000A
JPH06333000A JP5116063A JP11606393A JPH06333000A JP H06333000 A JPH06333000 A JP H06333000A JP 5116063 A JP5116063 A JP 5116063A JP 11606393 A JP11606393 A JP 11606393A JP H06333000 A JPH06333000 A JP H06333000A
Authority
JP
Japan
Prior art keywords
color
characteristic data
reproduction characteristic
color reproduction
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP5116063A
Other languages
Japanese (ja)
Other versions
JP3461009B2 (en
Inventor
Noriaki Seki
範顕 関
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Business Innovation Corp
Original Assignee
Fuji Xerox Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fuji Xerox Co Ltd filed Critical Fuji Xerox Co Ltd
Priority to JP11606393A priority Critical patent/JP3461009B2/en
Publication of JPH06333000A publication Critical patent/JPH06333000A/en
Application granted granted Critical
Publication of JP3461009B2 publication Critical patent/JP3461009B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE:To efficiently cope with plural color spaces flowing through a network. CONSTITUTION:This device is provided with an input color reproducing characteristic data retaining part 3 where plural color reproducing characteristic data of an input device 5 are retained, a color correction part 1 for input use which uses color reproducing characteristic data retained by the input color reproducing characteristic data holding part 3 to perform the color correction from the color space of the input device to a reference color space, an output color reproducing characteristic data retaining part 4 where plural color reproducing characteristic data of an output device 6 are retained and a color correction part 2 for output use which uses color reproducing characteristic data retained by the output color reproducing characteristic data retaining part 4 to perform the color correction from the reference color space to the color space of the output device 6.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、入出力装置の色再現特
性に合わせて色補正を行う色変換処理装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color conversion processing device for performing color correction according to the color reproduction characteristics of an input / output device.

【0002】[0002]

【従来の技術】従来この種の色彩情報処理装置としては
X Window System(米国マサチューセッ
ツ工科大学の登録商標) version 11 re
lease 5(X11R5)のXcmsと呼ばれるシ
ステムがある。XcmsではRGBに限らず種々の入出
力装置の色再現特性に対応するため、これらの色再現特
性をX Device Color Characte
rization Conventionで定められた
CIE XYZと入出力装置のRGB(以後、デバイス
RGBと呼ぶ)の関係をスクリーンカラー特性データフ
ァイルとして保持するようにしている。このファイルは
CIE XYZとデバイスRGBとの関係を3×3マト
リックスおよびLUTで表現するようにしている。
2. Description of the Related Art Conventionally, as a color information processing apparatus of this type, X Window System (registered trademark of Massachusetts Institute of Technology, USA) version 11 re
There is a system called Xcms for release 5 (X11R5). Since Xcms corresponds to the color reproduction characteristics of not only RGB but also various input / output devices, these color reproduction characteristics are expressed by the X Device Color Character.
The relationship between CIE XYZ defined by the Rise Convent and RGB of the input / output device (hereinafter referred to as device RGB) is held as a screen color characteristic data file. This file expresses the relationship between CIE XYZ and device RGB as a 3 × 3 matrix and LUT.

【0003】[0003]

【発明が解決しようとする課題】従来のXcmsのよう
な色彩情報処理システムを用いれば、ネットワークに接
続された種々の入出力装置の色空間にも対応することが
できる反面、ネットワークの基準色信号がCIE XY
Z一つに固定されているため、現在のネットワークシス
テムのように複数の色信号が流れている状況では使いづ
らく、基準色信号に変換してネットワークに流すなどの
対応が必要であった。
If a conventional color information processing system such as Xcms is used, it is possible to deal with the color spaces of various input / output devices connected to the network, while the reference color signal of the network is used. Is CIE XY
Since it is fixed to one Z, it is difficult to use in a situation where a plurality of color signals are flowing as in the present network system, and it is necessary to take measures such as converting to a reference color signal and sending it to the network.

【0004】そこで、本発明の色変換処理装置は、ネッ
トワークを流れる複数の色空間に効率よく対応すること
を課題とする。
Therefore, it is an object of the color conversion processing apparatus of the present invention to efficiently deal with a plurality of color spaces flowing in a network.

【0005】[0005]

【課題を解決するための手段】本発明の色変換処理装置
は、入力装置の複数の色再現特性データを保持する色再
現特性データ保持手段と、前記色再現特性データ保持手
段の保持する色再現特性データを用いて入力装置の色空
間から基準色空間へと色補正を行う色補正手段を具備す
ることを特徴とする。
A color conversion processing device according to the present invention comprises a color reproduction characteristic data holding means for holding a plurality of color reproduction characteristic data of an input device, and a color reproduction held by the color reproduction characteristic data holding means. It is characterized by further comprising color correction means for performing color correction from the color space of the input device to the reference color space using the characteristic data.

【0006】また、本発明の色変換処理装置は、出力装
置の複数の色再現特性データを保持する色再現特性デー
タ保持手段と、前記色再現特性データ保持手段の保持す
る色再現特性データを用いて基準色空間から出力装置の
色空間へと色補正を行う色補正手段を具備することを特
徴とする。
Further, the color conversion processing device of the present invention uses the color reproduction characteristic data holding means for holding a plurality of color reproduction characteristic data of the output device and the color reproduction characteristic data held by the color reproduction characteristic data holding means. It is characterized by comprising a color correction means for performing color correction from the reference color space to the color space of the output device.

【0007】[0007]

【作用】複数の色空間に合わせた色再現特性データを用
いることで、無駄な色変換処理を省くことができるもの
である。
By using the color reproduction characteristic data matched to a plurality of color spaces, useless color conversion processing can be omitted.

【0008】[0008]

【実施例】図1を用いて本発明の実施例を説明する。Embodiment An embodiment of the present invention will be described with reference to FIG.

【0009】図1に示す色変換処理装置は、入力装置5
の複数の色再現特性データを保持する入力色再現特性デ
ータ保持部3と、前記入力色再現特性データ保持部3が
保持する色再現特性データを用いて入力装置5の色空間
から基準色空間へと色補正を行う入力用色補正部1、お
よび、出力装置6の複数の色再現特性データを保持する
出力色再現特性データ保持部4と、前記出力色再現特性
データ保持部4が保持する色再現特性データを用いて基
準色空間から出力装置6の色空間へと色補正を行う出力
用色補正部2を有している。
The color conversion processing apparatus shown in FIG.
From the color space of the input device 5 to the reference color space by using the input color reproduction characteristic data holding unit 3 that holds a plurality of color reproduction characteristic data of the above and the color reproduction characteristic data held by the input color reproduction characteristic data holding unit 3 An input color correction unit 1 that performs color correction, an output color reproduction characteristic data holding unit 4 that holds a plurality of color reproduction characteristic data of the output device 6, and a color that the output color reproduction characteristic data holding unit 4 holds. It has an output color correction unit 2 that performs color correction from the reference color space to the color space of the output device 6 using the reproduction characteristic data.

【0010】入力色再現特性データ保持部3は、各入力
装置5の複数の色再現特性データの組31,32,・・
を保持している。たとえば、色再現特性データの組31
は、RGB表色系で表された或る色空間内に存在する入
力画像を他の互いに異なった複数の表色系、たとえば、
XYZ表色系、NTSC RGBγ表色系、L* *
* 表色系等に変換するためのものである。また、色再現
特性データの組32は、RGB表色系で表された色再現
特性データの組31とは異なる色空間内に存在する入力
画像を他の複数の表色系、たとえば、XYZ表色系、C
IB RGB表色系、L* * * 表色系等に変換する
ためのものである。
The input color reproduction characteristic data holding unit 3 includes a plurality of color reproduction characteristic data sets 31, 32, ...
Holding For example, the color reproduction characteristic data set 31
Is an input image existing in a certain color space represented by the RGB color system, and a plurality of different color systems different from each other, for example,
XYZ color system, NTSC RGBγ color system, L * a * b
* It is for converting to color system. In addition, the color reproduction characteristic data set 32 includes an input image existing in a color space different from that of the color reproduction characteristic data set 31 represented by the RGB color system, and the plurality of other color systems, for example, XYZ tables. Color system, C
It is for conversion into the IB RGB color system, the L * u * v * color system, and the like.

【0011】また、出力色再現特性データ保持部4は、
各出力装置6の複数の色再現特性データの組41,4
2,・・を保持している。たとえば、色再現特性データ
の組41は、互いに異なった複数の表色系、たとえば、
XYZ表色系、NTSC RGBγ表色系、L* *
* 表色系等で表された画像を出力装置6の特性に合わせ
たRGB表色系に変換するためのものである。また、色
再現特性データの組42は、たとえば、XYZ表色系、
YCbCr表色系、L* * * 表色系系等で表された
画像を他の出力装置6の特性に合わせたCMY表色系に
変換するためのものである。なお、各色再現特性データ
は記憶容量の許す限り何個でも持てるものとする。
Further, the output color reproduction characteristic data holding unit 4 is
A plurality of color reproduction characteristic data sets 41, 4 of each output device 6
Holds 2, ... For example, the color reproduction characteristic data set 41 includes a plurality of different color systems, for example,
XYZ color system, NTSC RGBγ color system, L * u * v
This is for converting an image represented by a color system or the like into an RGB color system that matches the characteristics of the output device 6. The color reproduction characteristic data set 42 includes, for example, an XYZ color system,
It is for converting an image represented by the YCbCr color system, the L * a * b * color system, or the like into the CMY color system that matches the characteristics of another output device 6. Note that as many color reproduction characteristic data as possible can be held as long as the storage capacity permits.

【0012】図1に示す色変換処理装置の動作につい
て、出力装置側の動作を例に挙げて説明する。
The operation of the color conversion processing device shown in FIG. 1 will be described by taking the operation on the output device side as an example.

【0013】いま、ある出力装置6についての複数の色
再現特性データは色再現特性データの組41であるとす
る。また、出力装置6のデバイス色空間はRGB3 とい
う仮想的な色空間であり、色画像の基準色空間はXYZ
であるとする。
Now, it is assumed that a plurality of color reproduction characteristic data for a certain output device 6 is a set 41 of color reproduction characteristic data. The device color space of the output device 6 is a virtual color space of RGB 3 , and the reference color space of the color image is XYZ.
Suppose

【0014】出力装置6に色画像を出力する場合、出力
用色補正部2は、入力用色補正部1から送られてきた色
画像および出力装置6がどのような色空間で表現されて
いるかを調べ、それらの色空間を表す色空間識別記号、
例えば”XYZ”および”RGB3 ”を、出力色再現特
性データ保持部4に送る。
When outputting a color image to the output device 6, the output color correction unit 2 represents in what color space the color image sent from the input color correction unit 1 and the output device 6 are represented. , A color space identification symbol that represents those color spaces,
For example, “XYZ” and “RGB 3 ” are sent to the output color reproduction characteristic data holding unit 4.

【0015】出力色再現特性データ保持部4は、登録さ
れている複数の色再現特性データの組の中から、送られ
てきた出力装置のデバイス色空間識別記号”RGB3
に一致する色再現特性データの組41を選ぶ。この中に
は複数の基準色空間と上記デバイス色空間との関係を表
す色再現特性データ411,412,413などが含ま
れる。なお、複数の色再現特性データ中の色再現特性デ
ータの個数も記憶容量の許す限り何個でも持てるものと
する。次に、色再現特性データの組41の中の複数の色
再現特性データ411,412,413から更に色画像
の基準色空間識別記号”XYZ”に一致する色再現特性
データ411を選び出し、これを出力用色補正部2に返
す。
The output color reproduction characteristic data holding section 4 selects the device color space identification code "RGB 3 " of the output device from the registered set of a plurality of color reproduction characteristic data.
The color reproduction characteristic data set 41 that matches with is selected. This includes color reproduction characteristic data 411, 412, 413 and the like representing the relationship between a plurality of reference color spaces and the device color space. It should be noted that the number of color reproduction characteristic data among the plurality of color reproduction characteristic data can be as many as the storage capacity allows. Next, from the plurality of color reproduction characteristic data 411, 412, and 413 in the color reproduction characteristic data set 41, the color reproduction characteristic data 411 that further coincides with the reference color space identification symbol "XYZ" of the color image is selected and is selected. It returns to the output color correction unit 2.

【0016】色再現特性データ411の例を図2に示
す。このデータは属性を表すタグと、実際の値との組み
合せで種々の属性を表現している。例えば、”Devi
ceName”というタグは、このデータが表している
装置の名前が次に表記されていることを表しており、”
ABC color printer XXX”が実際
の装置の名前となっている。同様に、”BasicCo
lorSpace”と次の”XYZ”が、基準色空間を
表すタグとその色空間識別記号であり、”ColorS
pace”と次の”RGB3 ”が、このデバイスの色空
間を表すタグとその色空間識別記号である。以下同様
に、”ReferenceWhiteXYZ”と次の三
つの数値が、基準白点を表すタグとその座標を示すXY
Z値であり、量子化レンジを示すタグ”Range”に
続く”RangeOriginalMin”と次の三つ
の数値がこのデバイスの色信号のRGBの最小値を表す
タグとその値であり、”RangeOriginalM
ax”と次の三つの数値がこのデバイスの色信号のRG
Bの最大値を表すタグとその値であり、”RangeM
in”と次の三つの数値が量子化後の信号のRGBの最
小値を表すタグとその値であり、”RangeMax”
と次の三つの数値が量子化後の信号のRGBの最大値を
表すタグとその値である。”RangeEnd”は、量
子化に必要なデータが終了したことを示すタグである。
An example of the color reproduction characteristic data 411 is shown in FIG. This data expresses various attributes by combining the tag showing the attribute and the actual value. For example, "Devi
The tag "ceName" indicates that the name of the device represented by this data is written next,
“ABC color printer XXX” is the actual device name. Similarly, “BasicCo
“LorSpace” and the next “XYZ” are the tag representing the reference color space and its color space identification symbol.
“Pace” and the next “RGB 3 ” are the tag representing the color space of this device and its color space identification symbol. Similarly, “ReferenceWhiteXYZ” and the next three numbers are the tags representing the reference white point. XY indicating the coordinates
Z value, which is a tag indicating the quantization range, followed by "RangeOriginalMin", and the following three numerical values are the tag indicating the minimum value of RGB of the color signal of this device and its value. "RangeOriginalMin"
ax ”and the following three numerical values are the RG of the color signal of this device.
A tag that represents the maximum value of B and its value.
in ”and the following three numerical values are a tag and its value that represent the RGB minimum values of the quantized signal, and“ RangeMax ”
The following three numerical values are a tag and its value representing the maximum value of RGB of the signal after quantization. "RangeEnd" is a tag indicating that the data required for quantization has ended.

【0017】タグ”Matrix”に続く”Matri
xCoeffients”と次の9個の数値がマトリッ
クス係数を表すタグとその値であり、”MatrixE
nd”はマトリックスに関するデータが終了したことを
示すタグである。
The "Matrix" following the tag "Matrix"
xCoeffients "and the next nine numbers are tags and their values that represent matrix coefficients.
"nd" is a tag indicating that the data regarding the matrix is completed.

【0018】タグ”LUT”に続く”LUTCompo
nents”と次の数値がLUT(ルックアップテーブ
ル)の数を表すタグとその値であり、”LUTEntr
ies”と次の数値がLUTの入力数を表すタグとその
値であり、”LUTData”と次の数値列がLUTの
データを表すタグとその値である。”LUTEnd”
は、LUTに関するデータが終了したことを示すタグで
ある。これらのデータは処理単位毎に記述されている。
"LUTCompo" following the tag "LUT"
"nents" and the next numerical value are tags and their values indicating the number of LUTs (look-up tables).
"ies" and the next numerical value are tags representing the number of inputs to the LUT and their values, and "LUTData" and the next numerical string are tags representing the data of the LUT and their values. "LUTEnd"
Is a tag indicating that the data related to the LUT has ended. These data are described for each processing unit.

【0019】出力用色補正部2は、出力色再現特性デー
タ保持部4より返された色再現特性データ411を用い
て色補正処理を行い、出力装置6に出力する。
The output color correction unit 2 performs a color correction process using the color reproduction characteristic data 411 returned from the output color reproduction characteristic data holding unit 4 and outputs it to the output device 6.

【0020】なお、ここでは出力装置側についてのみ説
明したが、入力装置側でも同様であるため説明を省略す
る。
Although only the output device side has been described here, the description is omitted because the same applies to the input device side.

【0021】また、上述した実施例においては、入力用
と出力用で別々に色再現特性データ保持部3および4を
持つものとして説明していたが、両者を一つのデータ保
持部で持つこと、および、これをネットワークサーバ化
することなども当然可能である。
In the above-described embodiment, the color reproduction characteristic data holding units 3 and 4 for the input and the output have been described separately, but having both in one data holding unit, And, of course, it can be converted into a network server.

【0022】[0022]

【発明の効果】以上述べたように、本発明によれば、複
数の色再現特性データを保持することで、複数の基準色
空間があったとしても、それに適した色再現特性データ
を用いて効率よく色変換処理を行うことが可能となる。
As described above, according to the present invention, by holding a plurality of color reproduction characteristic data, even if there are a plurality of reference color spaces, it is possible to use the color reproduction characteristic data suitable for them. It is possible to efficiently perform color conversion processing.

【図面の簡単な説明】[Brief description of drawings]

【図1】 本発明の実施例を示すブロック図である。FIG. 1 is a block diagram showing an embodiment of the present invention.

【図2】 本発明の実施例の色再現特性データを示す図
である。
FIG. 2 is a diagram showing color reproduction characteristic data according to an example of the present invention.

【符号の説明】[Explanation of symbols]

1…入力用色補正部、2…出力用色補正部、3…入力色
再現特性データ保持部、4…出力色再現特性データ保持
部、5…入力装置、6…出力装置、31,32,41,
42…複数の色再現特性データの組、411〜413…
色再現特性データ
1 ... Input color correction unit, 2 ... Output color correction unit, 3 ... Input color reproduction characteristic data holding unit, 4 ... Output color reproduction characteristic data holding unit, 5 ... Input device, 6 ... Output device, 31, 32, 41,
42 ... A set of a plurality of color reproduction characteristic data, 411-413 ...
Color reproduction characteristic data

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 FI 技術表示箇所 H04N 1/40 D 9068−5C 1/46 Z 9068−5C ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI Technical indication H04N 1/40 D 9068-5C 1/46 Z 9068-5C

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 入力装置の複数の色再現特性データを保
持する色再現特性データ保持手段と、前記色再現特性デ
ータ保持手段の保持する色再現特性データを用いて入力
装置の色空間から基準色空間へと色補正を行う色補正手
段を具備することを特徴とする色変換処理装置。
1. A reference color from a color space of an input device using color reproduction characteristic data holding means for holding a plurality of color reproduction characteristic data of an input device, and color reproduction characteristic data held by the color reproduction characteristic data holding means. A color conversion processing device comprising a color correction unit for performing color correction into a space.
【請求項2】 出力装置の複数の色再現特性データを保
持する色再現特性データ保持手段と、前記色再現特性デ
ータ保持手段の保持する色再現特性データを用いて基準
色空間から出力装置の色空間へと色補正を行う色補正手
段を具備することを特徴とする色変換処理装置。
2. A color of an output device from a reference color space using color reproduction characteristic data holding means for holding a plurality of color reproduction characteristic data of the output device and color reproduction characteristic data held by the color reproduction characteristic data holding means. A color conversion processing device comprising a color correction unit for performing color correction into a space.
JP11606393A 1993-05-18 1993-05-18 Color conversion processor Expired - Lifetime JP3461009B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11606393A JP3461009B2 (en) 1993-05-18 1993-05-18 Color conversion processor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11606393A JP3461009B2 (en) 1993-05-18 1993-05-18 Color conversion processor

Publications (2)

Publication Number Publication Date
JPH06333000A true JPH06333000A (en) 1994-12-02
JP3461009B2 JP3461009B2 (en) 2003-10-27

Family

ID=14677795

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11606393A Expired - Lifetime JP3461009B2 (en) 1993-05-18 1993-05-18 Color conversion processor

Country Status (1)

Country Link
JP (1) JP3461009B2 (en)

Also Published As

Publication number Publication date
JP3461009B2 (en) 2003-10-27

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